在寻求提高单元式热泵效率方面，两种最有希望的替代方案是地源热泵和变速空气源热泵。已经开展了一个项目，将这两种技术结合起来，生产出一种非常灵活、高效的供暖、制冷和热水系统。关于前两个开发阶段的测试结果的报告。该项目首先改造了一台10.6千瓦（3吨）的变速空气热泵。保留了压缩机、室内风扇、空气盘管和控制装置。将室外盘管更换为同轴水-制冷剂盘管，并添加了通风水加热盘管。进行了测试，冷却时的能效比范围为12.8至27.6 Bth/Wh（COP=3.8至8.1）。取暖警察从3.1到6.0不等。为了提高容量、效率和水加热能力，进行了进一步的修改。其中包括增强型恒温膨胀阀和可变- 泵速控制。试验正在第二级装置上进行。两台配有变速控制器的泵都运行良好。压缩机、风扇和泵的新控制器硬件已经组装，第一个控制逻辑程序已经成功测试。关键词:土壤热泵，热泵，空气热泵，设计，空调，水热泵，控制，速度，冷却。引用:研讨会，ASHRAE Trans。1994年，第100卷，第一部分

Two of the most promising alternatives in the quest for higher efficiency in unitary heat pumps are ground-source heat pumps and variable-speed air-source heat pumps. A project has been undertaken to merge the two technologies to produce a very flexible and efficient heating, cooling, and water-heating system. Reports on the test results of the first two phases of development. The project began with the modification of a 10.6 kW (3-ton) variable speed air heat pump. The compressor, indoor fan, air coil and controls were retained. The outdoor coil was replaced with a coaxial water-to-refrigerant coil and a vented water-heating coil was added. Tests were performed and EERs ranged from 12.8 to 27.6 Bth/Wh (COP = 3.8 to 8.1) in cooling. Heating COPs ranged from 3.1 to 6.0. Further modifications were made to enhance capacity, efficiency, and water-heating capability. These included enhanced thermostatic expansion valves and variable-speed pumping controls. Tests are being conducted on the second stage unit. Both pumps equipped with variable- speed controllers are performing well. New controller hardware for the compressor, fan, and pumps have been assembled, and the first control logic program has been successfully tested.KEYWORDS: soil heat pumps, heat pumps, air heat pumps, designing, air conditioning, water heat pumps, controls, speed, cooling.